American Airlines issued a 30-year, 7 percent semi-annual bond 4 years ago. The bond currently sells for 86 percent of its face value. The book value of the debt issue is $19 million. The company's tax rate is 34 percent. In addition, the company has a second debt issue on the market, a zero coupon bond with 4 years left to maturity; the book value of this issue is $79 million and the bonds sell for 75 percent of par.

(a) What is the company's total book value of debt? 98,000,000

(b) What is the company's total market value of debt? 75,590,000

My question is (c) What is your best estimate of the aftertax cost of debt?

A. 5.63%

B. 4.98%

C. 4.73%

D. 5.36%

E. 3.77%